Register VA API HW accelerators.

Pending bits from earlier approved patches:
https://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-March/066111.html
https://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-April/066918.html


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18313 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/allcodecs.c

@@ -54,6 +54,9 @@ void avcodec_register_all(void)
     initialized = 1;
 
     /* hardware accelerators */
+    REGISTER_HWACCEL (H263_VAAPI, h263_vaapi);
+    REGISTER_HWACCEL (MPEG2_VAAPI, mpeg2_vaapi);
+    REGISTER_HWACCEL (MPEG4_VAAPI, mpeg4_vaapi);
 
     /* video codecs */
     REGISTER_DECODER (AASC, aasc);